7975521 has 12 divisors (see below), whose sum is σ = 11549460. Its totient is φ = 5303520.

The previous prime is 7975519. The next prime is 7975531. The reversal of 7975521 is 1255797.

It can be written as a sum of positive squares in 2 ways, for example, as 2387025 + 5588496 = 1545^2 + 2364^2 .

It is not a de Polignac number, because 7975521 - 2¹ = 7975519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7975531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3711 + ... + 5451.

It is an arithmetic number, because the mean of its divisors is an integer number (962455).

Almost surely, 2^7975521 is an apocalyptic number.

It is an amenable number.

7975521 is a deficient number, since it is larger than the sum of its proper divisors (3573939).

7975521 is a wasteful number, since it uses less digits than its factorization.

7975521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256 (or 2253 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 7975521 is about 2824.0964926858. The cubic root of 7975521 is about 199.7957999159.

The spelling of 7975521 in words is "seven million, nine hundred seventy-five thousand, five hundred twenty-one".